Skiving-machine.



Patented June 1, 1915 M. NALLY.

SKIVING MACHINE.

APPLICATION FILED AUG.5, 19H- 1,141A81,

THE NORRIS PETERS CO., PHOIO-LITHQ. WASHINGTON. D C. 1 I

' To all whom it may concern:

MATTHEW NALLY, OF NEW YORK, N. Y., ASSIGNOR T0 UNITED SHOE MACHINERY COMPANY, OF PATERSON, NEW JERSEY, A CORPORATION OF NEW JERSEY.

Sm rna- ACHINE. 7

Specification of Letters Patent.

Patented June 1, 1915.

Application filed August 5, 1911. Serial 110,642,474.

Be it known that I, MATTHEW NALLY, a

citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in skiving Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. a

The present invention relates to skiving machines, and more particularly to that class of machines which are employed for Operating upon thin sheets of leather used in the uppers of shoes and for pocketbooks and articles of a like nature.

In order to impart a finished appearance to the edge of the leather and increase the wearing qualities thereof, a fold is made along the margin and this class of machines is used generally for trimming down or otherwise preparing the margin of the work for this fold. In addition to thinning down the margin, it is oftentimes desirable to form a groove in the surface of the leather adjacent to the margin, the groove determining the line upon which the margin is J folded, and insuring that the margin is folded back without any irregularity even when thework is performed by unskilled operator. It is desirable thatthis groove be of a uniform, even width and it is also desirable that the depth of the groove be varied according to the thickness of the material operated upon.

The object of the present invention is to enable a groove of an even and uniform:

width to be readily formed in the work and to enable the depth of the groove to be readily and conveniently varied when so desired.

With this object in view, the features. of the inventlon comprise certain novel features of construction, combinations and arrangements of parts hereinafter'described and claimed, the advantages of which will be apparent to those skilled in the art from the following description. v

In the accompanying drawings illustrating the preferred formrof the invention; Figure l is a detail showing a partial longitudinal section in elevation of a machine embodying the several features of the invention in their preferred forms; Fig. 2 is a detail illustrating a partial front elevation of the machine shown in Fig. 1; Fig. 3 is a detailshowing a top plan view of the machine with the presser foot removed and illustrating the slotted grooving plate in operative position; Fig. 4 is a view partially diagrammatic illustrating the action of the knife upon the work; and Fig. 5 is a detail showing the work in its finished form with a groove formed therein.

Certain parts of the machine are similar in construction and mode of operation to the machine shown and described in the copending application of Alexander, Serial No. 621,679, filed April 17 1911, and will be only briefly described herein in consequence thereof. This machine is provided with a cylindrical skiving knife indicated at 3 which is mounted within a casing 4: and projects upwardly through an opening in the same into a position to act upon the material. The material to be skived is fed to the knife 3 by a positively driven feed roll 5 which is yieldingly supported within the knife and which cooperates with a presser foot 6 mounted without the knife and arranged to act as a gage for properly presenting the work to the knife. The presser foot 6 is carried by a block 7 slidingly mounted in vertical guideways formed in the end of an overhanging arm 8, and means (not shown) are provided for determining the vertical position of the presser foot in order to bring it into cooperating relation with the knife edge. The work is guided into an operative position by an adjustable gage 9 which engages with the edge of the material as it is fed to the knife.

The margin of the work is generally prepared for folding by either beveling the margin of the work or cutting a groove in the work adjacent to the margin, or both. In order to cut a groove in the surface of the work, the working surface of the presser foot is provided with a projection which engages the work and presses a portion of it downwardly into the plane of the knife edge so that a narrow rib upon the surface of the work is removed by the knife and embodiment of the invention a rib is dewhen the work is flattened out, a groove is formed in the surface. In the illustrated tachably secured to the presser foot by a "set screw 11 and the rib is shaped to conform closely to the curvature of the working face of the presser foot in cross section. \Vith this arrangement, the rib may be readily removed from the presser. foot when itis not desired to use the same and existing machines may be conveniently adapted for cutting a groove when so desired.

' When-the presser footalone is employed,

and no other meansare provided for gaging V 15 v the width of the cut, the groove which is formed is irregular and not of a uniform width. In the present invention the width of the groove is accurately determined and the groove is formed of an even, uniform width by pressing that portion of the Work whichit is desired to remove through an cpenlng, the sides of whichengage the work upon opposite sides of the projection and operate to accurately gage the width of cut. In the simplest and most efficient form of the invention which has yet been devised,

' this is accomplished by providing what may i be termed a supporting plate which projects into an operative position in close proximity to the knife edge and between the presser foot and feed roll. This supporting plate is provided with a longitudinal slot through which the rib on the presser foot projects. An enlarged opening-is preferably formed in the plate at the commencement of theslot in order that the work may be readily forced into the slot without danger of bending or distorting the supporting plate in such-manner as to interfere with the accurate formation of the groove. The supportingplate 15 is bowed or arched in cross secthe casing by a plurality of set, screws 16.

tion and is fastened to the upper surface of This plate is employed in place of the usual plate used when beveling and no change is feed roll and presser foot. A longitudinal slot indicated. at 17 is formed in the front of the slot acting as a gage to accurately portion of the plate and the presser foot 7 is adjusted so that the rib 10 is positioned centrally of the slot, the work thus being pressed into the'slot by the rib and the sides determine the width of the portion which f is removedfrom the work. i l

By adjusting the presser foot vertically, the depth of the groove may be readily and accurately varied without affecting the operation of the supporting plate.

In order to enable the work to'be readily 'stantially as described.

forced into the slot, the commencement of the slot is provided witlran enlarged open- 7 ing indicated at 18, into which the Work is first forced, as indicated clearly in ig. 1. V The purpose'of this opening willbe clear when it is understood that it is easier to pressdown a considerable area of the sheet of leather than it is to press down a restricted portion of the leather, such as would be determined by the edges of the slot 17. By providing this opening, any

tendency of the work to press the supporting plate downwardly-instead of to press the work through the slot in the. supporting 7 plate is avoided While it ispreferred to employ the spe-c -cific construction and arrangement of parts shown and described, it is to be understood that this construction and arrangement is not essential except so far as specified in the claims and may be changed or modified without departing from the broader features of the invention; 7

Having thus described the inventio1 1,what is claimed is Q 1. A skiving machine having, in combinaof the knife, a presser foot upon the opposite side of the knife having a projection thereon, and a plate supported'betwe'en the feed roll and presser foota'nd having a slot tion, a skivingknife, a feed roll at one side 7 arranged to receive the projection uponthe presser foot, substantially as described.

2. A skiving machine having, in combination, a skiving knife, a'feed roll at one side of the knife, a presser foot'upon the'opposite side of the'knife, a rib mounted upon j the presser foot and a plate supported between the feed roll and presser 'foot and having a longitudinal slot into which the rib projects centrally, substantially as described.

3. A skiving machinehaving, incombinaa tion, a skiving knife, a feedroll at one side of the knife, apresser foot upon the opposite side of'the knife having a' projection thereon, and a plate supported between the feed roll and presser foot having a longitudinal slot arranged to receive the projection and an enlarged opening at thecommencement of the slot, substantially as described.

4. A skiving machine having, in combination, a skiving knife, a feed roll at one side of the knife, a presser foot uponthe opposite side of the knife having a rib, and

meansengaging the work on opposite sides" of the rib for gaging the width of cut, sub- 5. skiving machine having, in combination, a skiving kn1fe,-a feed roll, a work support provided with a slot of uniform width, and means for pressing the surface of the material through the slot into position to be .removed by the knife in order position to be engaged and removed by the to form a cut of uniform Width, substanknife upon the opposite side of the plate, 10

tially as described. the edges of the slot acting to gage the 6. A skiving machine having, in combina- Width of out made by the knife. 5 tion, a skiving knife, a plate provided with MATTHEW NALLY.

a slot, and cooperating members upon oppo- Witnesses: site sides of the plate constructed to press a FREDERIC HOLMES, portion of the Work through the slot into ADOLPH BYCK.

Games at this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington. D. 0." 

